Table 1.
Isotherm parameters and correlation coefficients for the investigated heavy metals using nano-sorbents (CuO NPs-1 and CuO NPs-2).
| Heavy metals | Nano-sorbents | |||||
|---|---|---|---|---|---|---|
| CuO NPs-1 | CuO NPs-2 | |||||
| Pb(II) | Ni(II) | Cd(II) | Pb(II) | Ni(II) | Cd(II) | |
| qm exp (mg g−1) | 88.80 | 54.90 | 15.60 | 82.80 | 21.90 | 8.4 |
| Langmuir model | ||||||
| qm cal (mg g−1) | 126.58 | 126.58 | 22.57 | 125.00 | 54.35 | 12.15 |
| KL (L mg−1) | 0.19 | 0.03 | 0.06 | 0.14 | 0.02 | 0.07 |
| R2 | 0.92 | 0.98 | 0.99 | 0.94 | 0.92 | 0.96 |
| Freundlich model | ||||||
| Kf (mg g−1) (mg L−1)n | 22.15 | 4.98 | 2.16 | 16.71 | 1.41 | 1.33 |
| n | 0.59 | 0.79 | 0.57 | 0.64 | 0.79 | 0.55 |
| R2 | 0.99 | 0.99 | 0.98 | 0.99 | 0.99 | 0.97 |